Method of and means for producing hollow billets for hollow drills



I) 2, 1924. F. F. GORDON METHOD OF AND-MEANS FOR PRODUCING HOLLOW BILLETS FOR HOLLOW DRILLS Filed Dec. 1921 FIG. 2;

Patented Dec. 2, 1924i.

[TED STATES FREDERICK FELIX GORDON, OF SHEFFIELD. ENGLAND.

METHOD OF AND IVJZEANS FOR PRODUCTNG HULLOW' BILLETS FOR HOLLOVJ' DRILLS.

Application fi'led December 29, 1921.

To aZZ- whom it may concern:

Be it known that I, Fnnnnnu'ii FELJX -lonnoiv of @sgathorpe House, Usgathorpe Road, Iiiheffield, in the county of York, England, a subject of the King oi Great Britain and Ireland, have invented certain new and useful Improved Methods of and Means for Producing Hollow Billets for Hollow Drills, of which the following is a s,r ecification.

This invention relates to an improved method oi and means for producing hollow billets for hollow drills and the like.

Hithereto, in the manufacture of hollow bars for drills it has been the practice to cast the suitable hard tool steel into comparatively large ingots and then hammer or roll them down into billets or blooms. These billets or blooms are then bored out or pierced proportionately to give the required hole in the drill rod. One end of the hole is then plugged and sand or other material placed in the hole to form a core, after which the other end of the hole is plugged, the billet being then rolled or hammered down to the required size of bar or rod to be produced.

This process is somewhat costly in that the boring out of the billet which is of hard tool steel, entails waste of comparatively expensive metal and the wear on the specially hard boring tools also is heavy and costly.

According to this invention the cogging or rolling of the ingots to form the billets or blooms is eliminated.

The production of hollow billets accord ing to this invention consists in directly producing a compound hollow billet to the required size and shape by casting molten metal around a hollow cylindrical metal core and further consists in the means and apparatus for carrying this improved method into effect.

One form of producing hollow billets according to this invention consists in casting molten metal around a hollow cylindrical core of mild steel, the molten metal becoming welded to the hollow cylindrical core whereby the hole in the said hollow cylindrical core becomes the hole in the billet.

Tn casting a hollow billet as above described, it is necessary to employ a specially crmstructed runner brick of refractory maicrial at the bottom of a mould and having one or more suitable openings and a depression, recess or projection whereby the hol- Serial No. 525,568.

low cylindrical core can be arranged centrally of the mould, so that in the process or casting, the molten metal rises upwards through the openings and flows around the hollow cylindrical core.

teferring to the drawings filed herewith.

Fig. l is a perspective view of one form of runner brick adapted to be used in carrying out the improved method of casting hollow billets according to this invention.

Fig. 2 is a perspective view of a mould.

Fig. 3 being a sectional elevation of same on the line A A Fig. 4:, showing the runner brick and hollow cylindrical core in posi tion ready for a cast.

Fig. 4 is a plan of Fig. 3, the lid of the mould being removed.

Fig. 5 is a perspective view of an alternative form of runner brick.

a is a longitudinal hole in the brick, c an indent or depression and (Z, (Z openings in the upper half of the brick communicating from the hole a to the interior of the mould e. The brick is formed with a spigot at one end and with a socket g at the other end. The mould is provided with a lid it having a hole j into or through which protrudes the hollow core k. The mould is also split longitudinally and provided with lugs m bored to receive cotter bolts n, for securing the two halves together.

In use, the brick is placed at the bottom of the mould e, the hollow core is being placed vertically within the mould and with one end resting in the depression 0 and the other end entering the hole j in the lid it thus ensuring that said hollow core is disposed centrally of the mould. The molten metal, when being poured in the usual way,

flows through the hole a in the brick and up wards through the openings d, (Z and thereby evenly around the hollow core 72.

The moulds may be round, square, octagonal or any other suitable shape externally.

Any number of bricks may be connected together to form a continuous runner where two or more billets are cast in one operation by fitting the spigot f of one brick into the socket g of another, the depression 0 always being centrally under the mould.

If desired a larger brick having a number of depressions, recesses or projections with the corresponding openings may be used with a number of moulds, there being a depression recess or projection and openings for each mould.

Wl'uit I claim and desire to secure by letters Patent is:

1. Means "for producing hollow billets for hollow drills comprising a unit consisting of a molten-metal receivingopen-ended tubule-r brick having a spigot and e socketat the opposite ends, openings and a central recess in the upper side of said brick, a twopart mould surmounting said brick and in open connection therewith, a removable cover to said would, a central opening in said cover; and e hollow core positioned in mould with its opposite ends seated in 1d cover-opening and brick-recess.

ll leains for producing hollow billets for hollow drills comprisingn unil' consisting of n molten-metal receivingopen-ended tubulei' brick having a spigot :md :i socket :il lhe opposite ends. k1 plurality oi? openings and re s in the upper side of said brick, a plurality of moulds positioned on said brick centrally over said o 'ienings and recesses cover or each mould with :i central opening therein, and n hollow core positioned in each mould with one end seated in :1 brich-re ess and the other end in the cover-opening ln testimony whereof I have signed my name to this specification.

FREDERICK FELIX GURDON. 

